class RegexString{

  static const String card =r'(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)';

  static const String phone = r'^(13[0-9]|14[01456879]|15[0-35-9]|16[2567]|17[0-8]|18[0-9]|19[0-35-9])\d{8}$';
}